Open window sash lock



May 29, 1934. A. H. MAGUIRE 1,960,543

OPEN WINDOW SASH LOCK Original Filed April 28, 1932 Patented May 29, 1934 UNITED STATES PATENT? OFFICE Application April 28, 1932. Serial No. 607,988 Renewed March 12, 1934 4 Claims.

My present invention relates to window locks and. more particularly to a lock which will keep the two sash members of a window in a locked relation when one of the sash members has been 5 slightly opened.

Heretofore, most window locks have been designed to hold the sash members in a locked closed position. In my improved invention I have designed a sash lock which can only be operated from the inside of the house but yet allow the window to be opened a short distance for ventilation purposes.

The principal object of my invention therefore is an improved open window sash lock;

Another object is an open window sash lock which cannot be operated from the outside of the window when the lock is in operating position;

Other objects and novel features comprising the construction and operation of my invention 20 will appear as the description of the same progresses.

Referring to the drawing illustrating the preferred embodiment of my invention;

Fig. 1 is an inside elevation of a window frame and sash showing my improved lock in operation;

Fig. 2 is an exaggerated cross-section taken on the line 2-2 of Fig. 1;

Fig. 3 is another cross-section similar to Fig. 2 but showing the lock in an open position;

I 30 Fig. 4 is a cross-section taken on the line 44 of Fig. 2;

Fig. 5 is a plan view of the lock catch member removed from the locking lever, and

Fig. 6 is another view of Fig. 5 taken at ninety degrees thereto.

Referring more in detail to the drawing, 10 designates a window casing within which are mounted two sliding sash members 11 and 12. The upper sash 11 is provided at one or both sides 40 with an insert member comprising side frames 13 and 14 which may be composed of one piece or of two pieces as shown in the drawing being securely held together in any suitable manner as rivets 15, both members 13 and 14 being secure- 1y held in a recess 16 provided in the sash 11 by means of wood screws 17. The central portion of the members 13 and 14 comprises a slot 18 in which is pivoted at 19 a locking lever 20 the pivoted end of which is provided with an off-set dog member 21 which is adapted to lie over the top of the lower sash 12 when the window is in a locked position as shown in Fig. 2. It will be noted in Fig.2that when the windowisinalocked position the long lever portion of the pivoted member, indicated in general at 22, lies in the lower portion of slot 18 and flush with the outer side of the sash 12 such that the sash member 11 may be raised but cannot be lowered because of the dog member 21. The locking device should be so proportioned and located in the sash 11 that the upper edge of the sash 11 is within a fraction of an inch from being seated when the lever 22 is high enough to swing outward over the top of the sash 12. A recess 23 is provided in the sash recess 16 to allow the dog member 21 to pivot around to a rear position as shown in Fig. 3. In Fig. 3 the lever 20 is in an open position such that the sash 11 may be slid up or down past the sash 12. It will therefore be seen that so long as the lever 20 remains in a position like that shown in Fig. 2 it will be impossible for anyone on the outside of the window to either push down the upper sash further than the dog 21 will permit or to push up the lower sash any amount larger than the opening provided above the upper sash, and it is also impossible for anyone to insert any instrument over the upper sash or under the lower sash for the purpose of changing the position of the lever 20.

In order to prevent the lever 20 from becoming displaced when in an open position as shown in Fig. 3, I have provided a simple catch member 25 slidably mounted in the lever 20 in a slot 26. A slot 27 is also provided in the lever 20 and located at ninety degrees to the slot 26. The catch member consists of two bar-like members located one above the other and positioned at ninety degrees to each other such that the upper bar portion 28 operates in the slot 26 while the lower bar portion 29 operates in the slots 27. On the side portions of the members 13 and 14 are provided bayonet slots 30, the open portion 31 of the bayonet slots 30 facing the inside of the window sash such that when the catch 25 is in an extreme upward position and the lever 20 swung into the opening 18 of the frame the ends of the bar member 29 will enter the opening 31 of the bayonet slot and may then he slid downward thereby locking the lever 20 in place. In a like manner the lever 20 may be locked in its other position as shown in Fig. 2. The side of the lever 20 may be slightly relieved at a point 35 adjacent the area surrounding the ends of the bar portion 28 such that the finger of the operator is able to engage the ends of the portion 28 of the catch 25 for the purpose of sliding it up or down in the slots 26 and 27.

Having thus described my invention what I claim as new is:

1. A window sash lock comprising a casing member inserted in one side of the upper sash, a dog member pivoted in said casing and comprising an outstanding portion located at one end and to one side of said pivot and a tongue member adapted to fit in said casing, means located in said tongue portion of said dog member adapted to slide in bayonet slots located in said casing member for the purpose of locking said dog member in a vertical position.

2. A window sash lock comprising a casing member provided with slotted end portions, a split dog member pivotally disposed in said casing and provided with a tongue portion, a pin member slidably disposed through said tongue member and adapted to engage with said slots.

extremity of the said dog member adapted to engage with the said slots in the casing.

ARTHUR H. MAGUIRE. 

